<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>第八章 BOM编程</title>
</head>
<body>
    <div>
        <button onclick="clickToTopLeft()">弹窗</button>
        <button onclick="checkLoactionInf()">location对象</button>
        <button onclick="checkNavigator()">navigatorr对象</button>
    </div>
</body>
<script src="js/chp8-1BOM.js"></script>
</html>